mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
51 lines
1.4 KiB
ArmAsm
51 lines
1.4 KiB
ArmAsm
/* ffsll -- find first set bit in a long long, from least significant end.
|
|
Copyright (C) 2013 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
.syntax unified
|
|
.text
|
|
|
|
ENTRY (ffsll)
|
|
@ If low part is 0, operate on the high part. Ensure that the
|
|
@ word on which we operate is in r0. Set r2 to the bit offset
|
|
@ of the word being considered. Set the flags for the word
|
|
@ being operated on.
|
|
#ifdef __ARMEL__
|
|
cmp r0, #0
|
|
itee ne
|
|
movne r2, #0
|
|
moveq r2, #32
|
|
movseq r0, r1
|
|
#else
|
|
cmp r1, #0
|
|
ittee ne
|
|
movne r2, #0
|
|
movne r0, r1
|
|
moveq r2, #32
|
|
cmpeq r0, #0
|
|
#endif
|
|
@ Perform the ffs on r0.
|
|
rbit r0, r0
|
|
ittt ne
|
|
clzne r0, r0
|
|
addne r2, r2, #1
|
|
addne r0, r0, r2
|
|
bx lr
|
|
END (ffsll)
|